Crankshaft Main Bearing Journal Taper and Out-of-Round
WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- Use a 75-100 mm (3-4 in) micrometer to measure the diameter of each main journal. Measure the journal at 2 points, 90 degrees apart. Measure and record readings for each of the 4 main journals. The difference between readings will be the main journal out-of-round value. For additional information, refer to SPECIFICATIONS .
NOTE:
To prevent engine damage, the crankshaft must be re-ground or a new crankshaft installed if journals exceed maximum out-of-round and/or taper specifications.